Fastener to clamp boards on scaffold brackets



April 28, 1925. 1,535,241 o. c SNODGRASS ET AL FASTENER 'I'O CLAMPBOARDS ON SCAFFQLD BRACKETS Dri'g'ina i Filed M324. 1925 gwuenhz:

Patented Apr. 28, 1925.

UNITED STATES PATENT OFFICE.

OSCAR CLINTON SNODGRASS, AUG-ISS'IA BURCH HAWKINS, AND WILLIAM F.STAGGERS, OF MANNINGTON, WEST VIRGINIA.

FASTENER TO CLAMP BOARDS ON" SCAFFOLD BRACKETS.

Application filed May 24, 1923, Serial No. 641,177. Renewed liehrualy a,1925.

To all whom it may concern.-

Be it known that we, Oscar: Cmn'ron SNononass. Arisiss'm BURCH Hmvnirrs,and WILLIAM F. S'rAeonns, citizens of the United States, residing atMannington, in the county of Marion and State of West Virginia, haveinvented new and useful Fasteners to Clamp Boards on Scaffold Brackets,of which the following is a specification.

In erecting and working on scaffolding workmen are sometimes injured byreason of the boards slipping on the brackets which support them,resulting in serious injury. To prevent the possibility of accidents ofthis sort occurring we have devised fasteners which securely clamp theboards on metal scaffold brackets in the desired position that theboards cannot slide in any direction.

We attain the objects of our invention by the device illustrated in theaccompanying drawings, in which Figure 1 is a perspective view of ourinvention in use on a scaffold bracket;

Fig. 2 is a side elevation of the improved and preferred form of ourinvention;

Fig. 3 is a section on line 33 of Fig. 2, showing an edge view of ourdevice;

Fig. 4 is a side elevation of another form of our invention;

Fig. 5 is a section on line 5--5 of Fig. 4: showing an edge view of ourdevice;

Fig. 6 is a side elevation of the original form of our invention, and

Fig. 7 is a section on line 7-7 of Fig. 6, showing an edge view of ourdevice.

Like numerals designate like parts in each of the several views.

Referring to the accompanying drawings, in Fig. 1 is illustrated theconventional folding scaffold brackets 1, the horizontal members ofwhich consist of pipes on which the boards or planks 2 of the scaffoldare supported. We provide like clamping plates 3, connected by a hinge4t and shaped to engage around the horizontal members of the scaffoldbracket 1. Clamping plates 3 are clamped together by suitable means,such as the bolt 8 and wing-nut 7 shown in Figs. 6 and 7, or the bolt 8shown in Figs. 2-5, which perform an equivalent function. We provide asuitable hook 5 having an end prong 12 which can be driven into theboard to hold it firmly in one fixed position on the scaffold brackets.The hook 5 may be of any suitable shape, such. as those illustrated inthe drawings, the form shown in Figs. 6 and 7 engaging the edge of theboard or the forms shown in Figs. 2 to 5 which en gage the top of theboard, the forms shown in Figs. 4- and 5 having an angular portion 9 asillustrated.

In the preferred form of our device, illustrated in Figs. 2 and 3, weprovide vertical slots 10 in clamping plates 3. We also provide a pin 11in the shank of clamp 5 in lieu of bolt 6 of the other forms andperforming an equivalent function, with the additional function that theslots 10 permit of vertical adjustment of the clamping hook 5 to adjustthe device to different sizes of blanks or boards which may be used tocomplete the scaffold at different times.

The operation of the device will be obvious from the accompanyingdrawings, the clamping plates 3 being clamped around the horizontalmembers of the scaffold brackets and the clamp hooks 5 having theirprongs driven into the boards of the scaffold to hold them in a positionin which they cannot slide, thus providing a secure and on tirely safesupport for the workmen using the scaffold.

What we claim is:

1. In a device of the class described, the combination of hingedlyconnected clamping plates suitably shaped to engage around a portion ofa scaffold bracket, means for securing said clamping plates tightly onthe scaffold bracket, the plates having vertical i slot-s, a clampinghook adapted to be driven into the board, said clamping hook having apin in its shank slidably mounted in the slotted portions of theclamping plates to permit of adjustment of the clamping hook

